Add interner lifetime and improve documentation #187

Job	Run time
Clippy	13s
Coverage	22s
Build (ubuntu-latest)	10s
Audit	13s
Build (windows-latest)	20s
Documentation	14s
Build (macos-latest)	20s
Formatting	15s
Miri	1m 9s
Outdated	6s
Test (ubuntu-latest)	32s
Test Memory Consumption (ubuntu-latest)	29s
Test (windows-latest)	35s
Test Memory Consumption (windows-latest)	33s
Test (macos-latest)	42s
Test Memory Consumption (macos-latest)	33s
	6m 46s

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